define carton model
(
    # carton is rectangular
    # so make a square and use size []
    polygons 1
    polygon[0].points 4
    polygon[0].point[0] [0 0]
    polygon[0].point[1] [0 1]
    polygon[0].point[2] [1 1]
    polygon[0].point[3] [1 0]

    # average carton size
    size [0.1 0.2]

    color "DarkBlue"
    gripper_return 1
)

